Sewage ejector



April 29, 19249 I I. C. JENNINGS SEWAGE EJECTOR Filed April 11, 1925 2 sheets-sham 1 ATTORNEY I. C. JENNINGS SEWAGE EJECTOR April 29, 1924.

Filed April 11, 1923 2 Sheets-Sheet 2 III/IA V ////////////III/1II//l/ ATTORNEY Patented Apr.

UNITED] STATES PATEN OFFICE.

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' SEWAGE EJECTOR application filed April 11, 192:. Serial at. 881,459.

To'all 'whom it may concern:

Be it known that I, InvrNo' C. Jnumues,

a citizen of the United 'States, residing at South Norwalk, county of Fairfield, State of Connecticut, have invented certain new and useful Improvements in Sewage Ejectors, of which the following is a specifica-.

tion. j

The present invention relates to apparatus for periodically charging a. closed vessel with fluid and thereafter emptying the same.

More particularly, the invention, relates to sewage ejectors.

At the present time, one of the principal systems for ejecting sewage from receivers comprises a receiver having an inlet and an outlet, each provided with a check valve, a float device within the receiver, a pipe having communication with the receiver and:

acting alternately as a vent and a means for supplying compressed air, valve mechanism controlled by the float'device for admitting compressed air to the receiver to expel its contents, and anair vent valve also controlled by said float device.

This system is rather comphcated andexpensive inasmuch as it requires a large.

storage tank for the compressed air, a relief valve for said tank, float mechanism and two valves, one controlling the supply of compressed air and the other the'ventof air from the receiver, and automatic mechanism for opening and closing these valves.

It is the'principal object of the present lnventlon to simplify these old constructions and to provide a dependable, comparatively simple and-inexpensive fluid ejecting system;

. More particularly, the present invention aims to provide an apparatus in which the storage tank for the compressed air, the com licated float device and separate automatically controlled air supply and air vent valves are eliminated.

To these ends, an air compressor is employed of the type in which, when'the' pump is idle, there is a free passage or communication between the inlet and outlet ports of the compressor but, when the pump is in operation, this communication is cutoff. A

compressor of the rotary type employing liquid for its pum ing action. such .as the well known Nash? ytor compressor: may he employed. The discharge of thisfcompresso'r.

pipe with the is .connected by means of a is idle,

receiver so that, when the'compressor a vent is automatically provided for that re- For this purpose, compressed -mitted to the receiver through air vent therefrom.

illustration of the type ceiver, permitting fluid to flow into the same. hen the compressor is in operation, however, tlns vent is cut oil and compressed air is supplied'to the receiver to eject liquid that has accumulated therein.

Other objects and features of novelty will be apparent from the description taken in connection with the drawings. in which:

Figure 1 is a sectional elevation of a sewage ejecting apparatus constructed in accordance with the present invention.

Figure 2 is asectional elevation of the compressor showing the position of the liquid employed therein, when the compressor is idle.

Figure 3 is an elevationof the compressor and the motor for driving the same and shows, diagrammatically, the switch for controlling the motor.

a Figure 4 1s an end view of the compressor showing, in section, a'separator on the inlet side thereof.

- Figure 5 1s a tion of the compressor. Referring to the drawings,

the numeral 10 indicates a liquid receiver which, as

longitudinal sectional eleva- 7 shown, is adapted to receive sewage and 1s' located in a concrete pit.. provided with a removable cover plate 11 to permit access to the interior thereof,

when necessary. The receiver also has an inlet 12 and an outlet 14:, each provided with a check valve 13 and; 15 respectively. In operation, fluid, such as sewage, flows hy gravity into the receiver through the 1nlet 12, passing by the check valve 13. After the receiver is filled up to the desired point, the fluid is expelled through the outlet 14.

air is adthe pipe 16,

a compressor 0 of a particular type being flow into the v The receiver is employed is has a free the reference numeral 26. When the compressor is in operation, the liquid turns with the rotor, but due to centrifugal force follows the periphery of the casing and thus forms an elliptical ring, as shown in Figure 1. It will be observed that the water alternately recedes from and re-enters the rotor pockets, twice in each revolution.

When the pockets of the rotor come oppo-'- site the inlet ports 24, the water recedes, permitting air to flow in and this charge of air. as the pockets approach the outlet ports 25, is compressed by the water reentering the pockets, acting like pistons. The compressed air is delivered through the outlet ports to the conduit 16 which communicates with the receiver 10. Obviously, when the compressor is in operation, the inlet and outlet ports are thus effectively sealed fromeach other, by the elliptical ring of Water. However, when the compressor stops, the water subsides or collects at the bottom of the casing, as shown in Figures 2 and 5, thus placing the inlet and outlet ports in communication. The

heads 29 of the compressor are made large .fj-enough so that the water will fall to a suliiciently low level to uncover the ports.

The compressor may be supplied with liquid, when necessary, through a pipe such as indicated at 30.

If it isdesired to autoi'natically control the operation of the compressor, any suitable means may be provided for this purpose. As shown, a ball float 31 is disposed within the receiver 10, being carried by the pivoted arm-32. This arm controls a pilot switch 33 of any suitable type. This pilot switch, by means of the conductors 34, is electrically connected with an automatic switch 35 which. controls the supply of energy from the mains 36 to the motor 37, the switch 35 being connected with the motor 37 by the electrical conductors 38.

In operation, the fluid, such as sewage, flows into the receiver through the inlet 12, the air in the receiver being vented through the pipe 16 and the compressor. When it reaches a predetermined high level in the receiver, indicated by the upper dotted line position of float 31,. Figure 1, the float closes switch 33-, in turn causing the closing of the automatic switch 35 and thus setting in operation. the motor 37. The rotor of the compressor, which is directly connected to the motor, is then set in rapid rotation, causing the water seal to assume the elliptical ring form shown in Figure 1, thereby eflectively sealing the inlet and outlet ports 24 and 25 from each other and causing air to be taken in through the inlet ports, compressed and delivered through the outlet. ports to pipe 16 above the surface of the liquid within the receiver 10. The liquid or sewage within the receiver is thus expelled from the same through the outlet 1-1, the check valve 13 preventing any back flow through conduit 12. When the liquid within the receiver reaches a predetermined low level, sucha's indicated by the lower dotted line position of the float 31, Figure 1, the float opens the pilot switch 33, which in turn causes the automatic switch to open, thus stopping the motor and compressor; the water within the compressor dropping to the position shown in Figure 2, thus placing the inlet and outlet ports of the compressor in communication with the pipe 16, and thus providing a vent for the receiver-10.

\Vhen the compressor is stopping and the water falling to the position shown in Figure 2, thus opening up the inlet and outlet ports, there may be a rush of compressed air from the outlet back through the inlet ports, carryingwatcr therewith. To catch this water, a separator 39 may be provided,

the same being inserted in the inlet line of the compressor. Any water that collects in this separator may be returned to within the casing 20 by a return pipe 40.

Although an embodiment of the invention has been described in detail, it is to be understood that it is not limited to the exact construction shown but includes modifications and changes which come within the sec )e of the appended claims.

Vhat I claim to be new and desire to secure by Letters Patent is:

1. The combination with a receiver having an inlet and outlet and means to prevent back flow therethrough, of a compressor having its discharge opening connected to said receiver, said compressor being of the type wherein the inlet and outlet ports are in communication when the compressor is idle, thereby providing a vent for the receiver, but are not in communication when the compressor is in operation.

2. The combination with a receiver having an inlet and outlet and means to prevent back flow thercthrough, of a compressor having its discharge opening connected to said receiver, said compressor being of the type wherein the inlet and outlet ports are in communication when the compressor is idle, thereby providing a vent for the receiver, but are not in communication when the compressor'is in operation, and means controlling the operation of said compressor in accordance with the amountof fluid in the receiver.

The combination with a receiver having an inlet and outlet and means to prevent back flow therethrough, of a compressor having its discharge opening connected to said receiver, said compressor being of the rotary type employing .fluid'for its compressing action, outlet ports are in communication when the compressor is idle, thereby providing a vent for the receiver, but are not in communication when the compressor is in operation.

4:. The combination with a receiver having an inlet and outlet and means to prevent back flow therethrongh, of a compressor having its discharge opening connected to said receiver, said compressor being of the rotary type employing fluid'for its compressing action, wherein the-inlet and outlet ports are in communication when the compressor is idle, thereby providing a vent for the receiver, but are not in communication when the compressor is in operation, and means controlling the operation of said compressor in accordance with the amount of fluid in the receiver.

5. A periodically operating ejector sys--v tem, comprising a receiver for the fluid to be ejected, inlet and outlet conduits provided with check valves communicating with said receiver, an air conduit communicating with said receiver, a compressor communicating with said air conduit, said compressor having a liquid seal adapted during the operation thereof to cut of? communication between the inlet and outlet ports of said compressor and adapted to effect communication between saidports when the compressor stops, a motor operating said compressor, means to set said motor in operation when the fluid reaches a, predetermined high level in said receiver to cause the compressor to deliver compressed air to said receiver and eject the fluid therefrom, and to stop said motor when the material reaches a predetermined low level, the liq uid seal then automatically effecting free communication between theatmosphere and receiver to permit fluid again to flow thereinto. j i

6. A periodically operating ejector system, comprising a receiver for the material to be ejected, inlet and outlet conduits provided with check valves communicating with said receiver, an air conduit communicating with said receiver, a compressor communicating with said air conduit, said compressor having a liquid seal adapted during the operation thereof to cut off communication between the inlet and outlet ports thereof and adapted to effect communication be between the wherein the inlet and from and to stop said when idle,

tween said ports when the compressor stops,

means to set said compressor m operation when the material reaches a predetermined high level in said receiver to deliver compressed air to said receiver and eject the material therefrom and to stop said compressor, when the material reaches a predetermined low level, the liquid seal then automatically effecting free atmosphere andreceiver through the compressor to permit material to flow again thereinto.

7. A periodically operating ejector sy's tem, comprising a closed receiver for the material to be ejected, an air conduit communicating with said receiver, a compresso'r having an outlet port communicating with said air conduit, said compressor hava liquid seal adapted during the operain tioh thereof to cut oif communication between the inlet and outlet ports thereof and material reaches a predetermined high level in said receiver to deliver compressed air to said receiver and e ect the material therecompressor when the material reaches a predetermined low level, the liquid seal then automatically efi'ecting free communication between the atmosphere and receiver through the compressor, to permit the material to flow again into said receiver.

8. A periodically operatinge ector system, comprising a closed receiver for thematerial who ejected, inlet and. outlet conduits provided with check valvescommun leating with said receiver, an air conduit communicating with said receiver, a, compres'sor having an outlet port communicating with said air conduit, said compressor having means for elfecting free communication between the inlet and outlet ports thereofmeans to setsaid compressor in operation when the material reaches a predetermined high level in said receiver to deliver compressed air-to said receiver and eject the material therefrom and to stop said compressor when the material reaches a predetermined low level, automatically efiecting'free communication betweenthe atmosphere and receiver through said means then the compressor, to permit the material toflow again into said receiver.

9. -A periodically ope'ratmg tem, comprising a-closed receiver for the material tobe ejected, inlet'and outlet conduits cut oif communication between its inlet and ejector sysv outlet ports and adapted to efl'ect communication between said ports when the compressor stops, an electric motor operating said compressor, a float 1n said receiver, a switch controlling sa1d motor operated by isaid float, whereby when the material reaches a predetermined high level in said receiver the motor circuit is closed and the pressor, said liquid seal then automatically effecting free communication between the receiver and atmosphere through said compressor to permit material to flow again into said receiver.

10. A sewage ejector system, comprising a closed receiver, inlet and outlet sewage conduits having check valves communicating with said receiver an air conduit communicating with said receiver an air compressor communicating with said air conduit, said compressor having a'liquid seal adapted during the operation thereof to cut off communication between its inlet and outlet ports and adapted to connect said ports when the compressor stops, a motor operating said compressor, means to set said motor in operation when the sewage reaches a predetermined high level in said receiver to cause the compressor to deliver compressed air to said receiver and eject the sewage therefrom and to stop said motor when the sewage reaches a predetermined low level, the liquid seal then automatically effecting free communication between the atmosphere and receiver through said compressor to permitlsel age again to flow into said receiver.

1 closed receiver, inlet and outlet sewage conduits having check valves communicating with said receiver, an air conduit communicating with said receiver, a compressor having an outlet port communicating with said air conduit, said compressor having a'liquid seal adapted durin compressor to out 0 communication between its inlet and outlet ports and ada ted to effect communication between sai ports when the compressor is idle, an electric motor operating said; compressor, a float in said sewage receiver, a switch controlling said motor operated by said float, whereby when the sen-age reaches a predetermined high level the compressor is set in operation and delivers compressed air to said receiver, ejecting the sewage therefrom, and whereby when the sewage reaches a predetermined low level the compressor stops, the liquid seal therein automatically effecting communication between the atmosphere and re ceiver through the compressor, to permit sewage to flow again into said receiver sewage ejector system, comprising athe operation of the 12. A sewage ejector system, comprising a closed receiver, inlet and outlet sewage conduits having check valves commumcating with said receiver, an air conduit communicating with said receiver, an air compressor having an outlet port communicating with said air conduit, said compressor comprising an elliptical casing and arotor operating therein having a plurality of radially extending pockets open at their outer ends, said compressor having inlet and outlet ports adapted to communicate with the inner ends ceiver.

13. The combination with a liquid receiver having an inlet and outlet, means for preventing back flow therethrough, an air compressor connected thereto, and means whereby the compressor will be set in opera tion at a high level of liquid in the receiver and thrown out of operation at a low level thereof.

14. The combination with a liquid receiver having an inlet and outlet, means for preventing back flow therethrough, an air compressor connected thereto, means whereby the compressor is set in operation at a high level of liquid in the receiver and thrown out of operation at a low level thereof, the compressor being connected and I arranged so that the admission and vent of air from the receiver will be controlled by the starting and stopping of the pump.

15. The combination with a liquid receiver having an inlet and outlet, means for preventing back flow thcrethrough, an air compressor connected thereto, a motor for driving the air compressor, means whereby the motor is set in operation at a high level of liquid in the receiver and thrown out of operation at a low level thereof and connections whereby the admission and vent of air from the receiver will be controlled by the starting and stopping of the motor.

16. The combination with a liquid receiver having an inlet and outlet, and means for preventing back flow therethrough, of an air compressor connected thereto, means whereby the compressor is set in o ration at a high level of liquid in'the receiver and thrown out of operation at a low level thereof, and an air vent controlled by the pump by the pump which allows the air in the rewhich allows the air m escape when the pump is thrown out of operation.

17 The combination with a li uid receiver having an inlet and outlet, an means for preventing back flow therethrough, of an air compressor connected thereto, means whereby the com ressor is set in operation at a high level 0 liquid in the receiver and thrown out of operation at a low level thereof, and an air inlet and vent controlled ceiver to escape when the pump is thrown out of operation.

18. The combination with a liquid rethe receiver to.

ceiver having an inlet and outlet, and means ,by the pump which allows air to pass to the pump when it is in operation and which allows the air in the receiver to escape when the pump is thrown out of operation. In testimony whereof I hereunto afix my signature.

IRVING C. JENNINGS. 

